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. 2019 Feb 14;9:2029. doi: 10.1038/s41598-019-38556-0

Table 2.

Material parameters of our coated bilayer systems with mass density ρ, layer thickness d, and 10 keV photon penetration depth at the grazing incidence angle of 3 mrad.

Sample ρ [g/cm3] d [nm] dXP [μm]
B 4 C 2.37 15 0.021
Mo 10.22 20 0.002
SiC 2.85 50 0.006
Si 2.33 5·106 0.011

Note that the thickness of the B4C layer is comparable with the respective photon penetration depth, the thickness of the underlying coatings (Mo, SiC) is ten times larger than the respective photon penetration depth, and the thickness of Si wafer is much larger than dXP for Si.